Valve-grinding apparatus.



W. L. MILNER. VALVE GBINDING APPARATUS. APPLmATmH FILED In. a.

Patend Oct. 17, 1911.

Iliad M a /b 9 WILLIAM LEE MILNER, OF CINCINNATI, OHIO.'

VALVE-G-RINDING APPARATUS.

Specification of Letters Patent.

Patented 4Oct. 17, 191 1.

Application led January 3, 1911. Serial No. 600,498.

in is a speci cation.

.his invention relates to valve grinding apparatus and has for an object to produce a simple and eii'ective manually operated tool, which is adapted to rotate the valve, while it is in contact with the valve seat, so that' it will be ground to accurately fit the seat.

A further ob'ect is to produce a valve grinding tool w ich is simple and cheap to manufacture, and which. occupies little space while not in use.

These and other objects I attain by means of a tool embodying the features herein described, and illustrated in the drawingsaecompanying this application and forming a part t ereof.

In the drawings, Figure 1 is a perspective view of a tool embodying my invention andv shown in connection with a gas engine valve, which is located on a valve seat, sl wn partially in section. Fig. 2 is a fragm ntal seotional view of the tool illustrated in Fig. l.

The tool illustrated. as an embo iment of m invention consists of a bit or shank 3, wliich is rotatably mounted on a handle 4 and is provided'with a manually actuated rack 5. The handle 4 .consists of a metallic collar `6, bored to receive the end of a wooden hand grasp or handle 7 and provided with a cylindrical bore 8, which is adapted to 11eceive the upper end of the bit 3. A bracket is integrally formed on the lower end of the handle 6 and consists of a laterally projecting arm 9, and an L-shaped arm 10, ythe free leg 11 of which extends parallel with the arm 9. Rollers 12 are rotatably mounted on the bracket between the ends of' the arms 9 and 10, and the leg 11 is provided withA an aperture 13, which is located in line with the bore 8, and through which the bit 3 is4 adapted to extend. A gear wheel 14 is mounted on the bit3 and is located between the leg 11 of the arm 10 and the lowerend of the collar 6:' The rack 5 is provided at one end with a handle 15, and is adapted to be inserted between the arm 9 and the log 11, and between the rollers 12 and the gear 14, so that its teeth mesh with the teeth of the gear, and so that the back of the rack contact-s With the rollers l2. 4

In assemblin r the bit Sand the handle 4, the gear 14 is first located in place between the leg 1.1 of the arm l() and the bottom face of the collar 6, so that the openin in the gear registers with the bore 8 and t e aperture 13. The upper end of the bit 3 is then forced upwardly7 through the aperture 13, the gear 14, and the bore. 8, and the gear is locked in place on the bit by any suitable means, such, for example, as a tapered pin 16, which extends diametrically through the gear and the bit, and may be locked in place by being riveted over at the small end, after it is in place. The lower end of the bit is flattened, so as to engage a slot 17, which is provided for its reception, either in the face of the valve 18, or in the upper end of the valve stem. 1

`The grinding operation is accomplished by reciprocating the rack while it is in mesh with thegear 14, and thereby turning the Valve disk 18 on its seat 19, first in one direction and then in the other. During the operation of grinding the valve, the downward or grinding pressure is manually applied to the handle 4 of the bit and is transmitted to the bit through the gear 14, which, with the lower end of the collar 6, forms a thrust bearing for the bit. The reciprocating motion of the rack is manually imparted to the handle L5, with which the rack is provided. 'I' he arms 9 and 10 and the rollers 12 hold the rack in engagement with the gear 14, Vduring the operation of grindin the valve, and the rollers prevent the racr from binding and also decrease the friction between the rack and the inclosing bracket.

When the tool is not in use, the rack is Withdrawn from engagement with the gear 14, and, consequently, the tool may be packed or placed in a much smaller space than if the rack were permanently locked in the operative position.

IV hat I claim is:

1. A tool of the character described comprising a handle, a bracket formed inte grally with the handle, a bit journaled in the handle and extending through the bracket, n gear mounted on the bit and forming a thrust bearing between the bit and the handle, a pin projecting through the gear and the bit for rigidly securing the gear to thebit, and a reciprccal rack for engaging the gear.

2. A tool of the chracter described commountvd upon the bracket, :m6, a, reciprocal prfsing a handle, a bracket formed il'iterack for engaging the gear adapted to be m grally with the handle, a, bib journaled in mounted on the. bracket betwmm the grmthe handle :md in theA bracket, a gear mnuntl and the rollers.

i ed on the bit and located 4between the han- WILLIAM LEE MILNE-.,

die and the bracket, u pin extending through 'Witnessem the gem' und the bit for securing the geur WALTER F. MURRAY, m ihn ML :md the bit to the handle, rolers E. W. MCCALLIQTRB. 

